For additional fun with theme-blending, set mash-ups, Ninja_Nin also created a "Baby Rock Monsters Nursery" scene with Power Miners bricks & Friends bricks:

So, if you read any hyperbole about LEGO Friends not being 'compatible' consider the source an unreliable one. Of course they are compatible -- all LEGO Bricks are! Says right there on the box, "Building toy" -- if you take the time to read facts.